Definitions by MajinVegeta

Mexican jumping bean 

When a guy goes down on a latin girl and she can't control herself, causing her to "jump" around uncontrollably. Can also refer to a vibrator called The Bean

Guy 1: I ate out Maria last night and she started shaking around so much I had to slow down.

Guy 2: Thats what you call a Mexican jumping bean

Mexican jumping bean by MajinVegeta May 26, 2013